Spark-plug.



D. H. YOST.

SPARK PLUG APPLICATION FILED SEPT. 19, 1912.

lsaom Patented Mar. 16, 1-915 .Wffl ,5

INVENTbR M MM ATTORNEY WITNES$E$ 6W .ipecificetiou of Letters Flatent.

"Patented-Mar.- 16,- 199115.

, .Qlpplica'tion filed September 19, 1812. Serial No. 721,167.

Toallw hom it may concern Be it known that l. l citizen of L city of York, c sylvania, inv W v 1 ful Improvements in .Elpai l5lugs, or which the following is a specification.

My invention relates to improvements in spark plugs adapted. tonuse in igniting the gas in internal combustion engines or the like. in devices of this character it has been found that from one cause or another particles of carbon are deposited upon the electrodes with the result that eilicient operation is prevented. I 1t is the object of my inyentiori to provide no r1. loss, a

ing in the '1', Mate oi. Benna spark plug having an improved and novel construction of electrode by the employment of which the deposition of an undue amount of carbon thereon is prevented.

In the construction 03": a spark plug em I bodyin'g the advantageous and novel features of construction of my invention, 1 employ a pendulum as one of the electrodes which is supported in operative relation to the other electrode. By the employment of a pendulum construction of electrode lhave been able to prevent the undue and ruinous deposition of carbon and thereby have enhanced theetllciency of spark plugs.

In order that the novel features of my invention may be understood and the same fully comprehended, l have illustrated one form of a convenient embodimentthereof in the accompanying drawings, in which Figure 1 is a central longitudinal sectional View in a horizontal plane of a spark plug provided with a pendulum electrode which is shown as being extended in the direction of the axis of the plug; Fig. 9. is an elevational view of the same looking toward the left of Fig. 1 the said plug being turned,

however, toward the left to a position at right angles to the position in which it is shown in Fig. 1 and the pendulum electrode being indicated in a plurality oi": positions;

a and Fig. 3 is view in side elevation looking toward the left in Fig. 1, the pendulum electrode being shown however, in a depending position.

Referring to the drawings, 1 designates a stationary member adapted to be secured in the side wall oi? a gas engine or other like apparatus means of the screu threads 2 which are shown upon one end portion thereon 3 designates a sleeve of insulating mate;

rial, such as porcelain, which extends through the said stationary member 1 and which is secured therein by means of a thin metallic sleeve 4; an interposed layer of cement or other securing means 5; and a screw plug '6 havingscrew-threaded engagement with the interior of the outer end of the stationary member 1.

7 designates a rod which extends through the insulating sleeve 3, its inner end projecting-beyond the inner end of thesaid sleeve, as shown at 8, and constitutilig one of the electrodes of the device. The iouter end of the rod 7 has connection with ,a screwthreacledprojection 10 to which a binding nut ll i's adapted to be secured in a known manner and for a known purpose.

The portion of the spark. plug and their In the construction shown 1 have illustrated the member 1 as being provided with a slightly tapered hole 13 which receives the correspondingly tapered end portion of the member 12, the'latter being permanently' secured in position. 1- The outer end portionl l of the member 12 is bentat right angles to the axis of the sleeve 3 and the rod 7 and is extended cross-wiseiof the same and in front of the end thereof -as shown in the drawings. 3

Pivotally mounted upon the transversely extended portion 14; is a pendulum 15, the outer or free end of which is provided with a pendulum bob 16 as usual. The pivoted ..end of the said pendulum is provided with a disk-like part 17 which constitutes one of the electrodes of my device. The inner end of the spark plug is located interiorly of the abuts e. collar 19 upon the transversely extended portion 14: of the electrode support.

nail

The electrode is secured upon the trans versely extending portion l l by means of a washer 20 and an upset portion 21 upon the end of the said transversely extending portion.

Preferably the spark plug is fitted and se cured in position in-the wall. of the engine or like apparatus so that the transversely extended portion 1a of the electrode support occupies a horizontal position so -that the pendulum is such that in swinging about its pivot it will strike the edge of the inner end portion of the stationary member 1 at oppo-...

site points as indicated in Fig. 2 of the drawings.

Upon reference to Fig. 3 of the drawings, it is clear to be seen that the portion let of the electrode support occupies a horizontal position and it will be understood that if the plug should be turned through a distance of 180 degrees the said support would still occupy such horizontal position.

It will be seen that the pendulum is limited in its movements and that instead of revolving entirely around its support it swings through the arc of a circle as is indicated in Fig. 2 of the drawings.

By providing the disk 17 with a depending weight as is illustrated; in other words, by employing a pendulum as one of the electrodes, I secure means whereby a substantial pivotal movement of one of the electrodes about its support, due to the vibratory action of the ei'igine and to the inrush and explosion of the gases, is made certain. One reason for this is that whenever through any cause the pivoted electrode is swung to a position other than its normally depending position, its return to normal position is preceded by a period of oscillatory movements due to the influence of gravity and the momentum of the pendulum. T'

1. A spark plug having means projecting forwardly from the body portion thereof and also having electrodes one of which is stationary with respect to the body structure of the said plug and the other one of which consists of a disk-like movable member loosely pivoted to said projecting means and having a depending weight connected thereto, the said disk-like member occupying a position in operative relation to the said stationary electrode.

2. A spark plug having a projection and electrodes, one of which electrodes consists of a disk-like oscillatable member loosely pivoted on said projection and having a depending weight integrally connected therewith, the said movable disk-like member occupying a position in operative relation to the other electrode.

3. A spark plug comprising a stationary body portion, a stationary electrode axially situated with respect to said stationary member, an elongated oscillatory electrode pivotally supported at one end in axial alinement with the said stationary member, the other end of the said elongated oscillatory electrode normally occupying a depending position and the said depending end being arrested by said stationary member at opposite ends of the path of oscillation to prevent complete revolution of the said oscillatory pivoted electrode.

In testimony that I claim the foregoing as my invention, I have hereunto signed my name this 16th day of September, A. D. 1912.

DONALD H. YOST.

In the presence of RICHARD F. YosT, Fain) R. Yos'r. 

